Anyone had problems with bearings coming apart? It has happened to me twice

Once for me. I bought a bearing meant for a V929 (less expensive than stock bearings) and put it in.
I later remembered that I have a bunch of leftover bearings for the prop shafts of GWS EPS300/350 class gearboxes (for airplanes).*
These bearings are somewhat thicker than stock, but look like they should fit.
I will probably try one on the next busted bearing.

*What is kind of amusing is that one of those old GWS EPS300/350 motor + gear boxes almost weighs as much as the AUW of an mQx. Things have shrunk in the last few years.

I have a question regarding flips. I got the mqx rtf with the toy transmitter as a gift. Flips are more like falling loops. I thought must be normal, then flew my friends WL toys one just like it on high rates and it flips super fast. Is this just the blade or is it because of the cheap toy radio? The WL toys one seems nicer all around btw.

I just got a MQX 3 days ago. I had no idea how much I would like quadcopters. I am so hooked now. I enjoy it way more than flying a heli. We held an indoor funfly this weekend, and I strapped a #11 keychain cam to it.
Towards the end of the video I collided with a plane doing 3D, and then I flew it up through the beams twice.
I had the camera mounted with velcro on the bottom, but the video was kind of shakey, if anyone could offer a suggestion for mounting to get rid of the shakes, I wouldn't mind.